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ISOBARS

ISOBARS. Familiar idea, new focus !. Isolines ( review). An isoline is a line connecting points of equal value. Examples of isolines:. Contour: points of equal altitude Isotherms : points of equal temperature Isobar : points of equal barometric (air) pressure

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ISOBARS

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  1. ISOBARS Familiar idea, new focus !

  2. Isolines(review) • An isoline is a line connecting points of equal value.

  3. Examples of isolines: • Contour: • points of equal altitude • Isotherms: • points of equal temperature • Isobar: • points of equal barometric (air) pressure • (The weather channel loves isolines!)

  4. Rules for Drawing Isolines: • 1. Isolines connect points of equal value. 5 5 10 10 10 10 15 15

  5. 2. Isolines are gentle, curving lines- no sharp corners. 5 5 10 10 10 10 15 15

  6. 3. Isolines are always closed curves even though the map might only show part of it.

  7. 4. IsolinesNEVER cross- this would mean that one point has two different values. Ex: one spot has two temperatures? 60 ° 50 ° 40 ° 30 ° X 20° Z Y

  8. 5. Isolines usually are parallel. (They have a parallel trend.)

  9. Gradient • Gradient shows how quickly the value changes from one point to another. Our “VALUE” is air pressure, when talking about isoBARS BARs BARometer  air pressure

  10. A steep (high) gradient changes quickly and the isolines are close together. • A gentle (low) gradient changes slowly and the lines are far apart. Steep area Gentle area

  11. 1016 mb H L

  12. 1016 mb H L 1012 mb

  13. 1016 mb H L 1012 mb 1008 mb

  14. 1016 mb H L 996 mb 1012 mb 1008 mb

  15. 1016 mb H L 996 mb 1012 mb 1000 mb 1008 mb

  16. 1016 mb H L 996 mb 1012 mb 1000 mb 1008 mb 1004 mb

  17. 1016 mb H L 996 mb 1012 mb 1000 mb 1008 mb 1004 mb

  18. Follow up questions: Describe the wind motion in theH. Describe the wind motion in theL. In what area is the wind speeds the greatest? Winds go from ___ to ____ for pressure.

  19. Summary • Winds around a High blow in a clockwise direction away from the center. (“The clock is high.”) Highs usually have fair weather. • Winds around a Low blow in a counter-clockwise and inward. (“The counter is low.”) Low pressure systems often have stormy or unsettled weather.

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